/* roulang page: index */
:root {
      --brand: #2B1E16;
      --gold: #C8A87C;
      --gold-hover: #B8946A;
      --warm-light: #FAF8F5;
      --warm-gray: #F2EDE8;
      --text-primary: #1F1812;
      --text-secondary: #6B5E53;
      --border-soft: #E5DDD4;
      --trust: #3D5A4A;
      --card-shadow: 0 2px 12px rgba(43,30,22,0.04);
      --card-hover-shadow: 0 8px 28px rgba(43,30,22,0.08);
    }
    
    * {
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 100px;
    }
    
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--warm-light);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 标题字体 */
    h1, h2, h3, .font-serif {
      font-family: 'Noto Serif SC', 'Songti SC', 'SimSun', 'STSong', serif;
      font-weight: 600;
    }
    
    /* 容器限制 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 640px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    
    /* 导航胶囊 */
    .nav-capsule {
      backdrop-filter: blur(12px);
      background-color: rgba(250, 248, 245, 0.85);
      border-radius: 40px;
      padding: 8px 24px;
      box-shadow: 0 4px 18px rgba(43,30,22,0.06);
      border: 1px solid rgba(200,168,124,0.18);
    }
    .nav-link {
      color: var(--brand);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.25s ease;
      position: relative;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      width: 0;
      height: 2px;
      background-color: var(--gold);
      transition: width 0.25s ease, left 0.25s ease;
      border-radius: 2px;
    }
    .nav-link:hover {
      color: var(--gold);
    }
    .nav-link:hover::after {
      width: 100%;
      left: 0;
    }
    .active-nav {
      color: var(--gold) !important;
    }
    
    /* 按钮系统 */
    .btn-primary {
      background-color: var(--gold);
      color: var(--brand);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 8px;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    }
    .btn-primary:hover {
      background-color: var(--gold-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(43,30,22,0.12);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--gold);
      color: var(--gold);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 8px;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background-color: var(--gold);
      color: var(--brand);
      transform: translateY(-2px);
    }
    
    /* 卡片 */
    .service-card, .case-card {
      background: #FFFFFF;
      border-radius: 12px;
      padding: 32px;
      border: 1px solid rgba(200,168,124,0.15);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }
    .service-card:hover, .case-card:hover {
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(200,168,124,0.35);
      transform: translateY(-4px);
    }
    
    /* 数字动画 */
    .counter {
      font-family: 'DIN Alternate', 'Arial', sans-serif;
      font-weight: 700;
      color: var(--trust);
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-soft);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    
    /* 流程连接线 */
    .step-line {
      position: absolute;
      top: 28px;
      left: 55%;
      width: 90%;
      height: 2px;
      background: linear-gradient(to right, var(--gold), transparent);
      z-index: 0;
    }
    
    @media (max-width: 768px) {
      .nav-capsule {
        padding: 8px 16px;
        border-radius: 32px;
      }
      h1 {
        font-size: 2.2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
    }